Just tried some:
5.6x57: No chance! Neck and bullets too slim, bullets too short.
7x57: Only long 175 gr round nose bullets, seated out to maximum length, work in a way, but sluggish and with hangups.
9x57 (got no 9.3x57 cartridges): Ok with round nose bullets seated to magazine length.
I would go to the 9.3x57 if barrel and reamer is availble, but prefer the original 9.5x57 M-S.